More than 75 million people across the United States, especially in the Midwest and East Coast, are living amid extreme heat alerts even before the first official day of summer this Thursday.
Much of the US Midwest has been witnessing scorching heat with temperatures expected to surpass 37.8 degrees Celsius (100 degrees Fahrenheit), with meteorologists saying the extreme heat is caused by excessive humidity and domes of hot air in the atmosphere. Weather scientists describe the phenomenon as heat domes.
